RE: [TCML] MMC Caps

["Dave Halliday" <dh@xxxxxxxxxxxxxx>]

These caps are optimized to work at 60Hz and are very lossy at several KHz.
The power lost translates directly into heat buildup in the cap -- short
life, spectacular (and messy) end.

Dave 

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx 
> [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Carl
> Sent: Saturday, October 19, 2013 18:29
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] MMC Caps
> 
> Hi---
> 
> I've never tried using them for a TC.  They're available in 
> Grainger.  The 
> run forever at the current rating on a 220V motor.  I've 
> never built a SSTC, 
> but these caps might be interesting to check into.
> 
> ---Carlos
> 
> 
> 
> 
> 
> -----Original Message----- 
> From: Mark X2
> Sent: Saturday, October 19, 2013 1:21 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] MMC Caps
> 
> Hi Carlos,
> 
> 20uF, that's quite impressive.
> How big of a coil are we talking about, just curious?
> 
> Why the 940C instead of the 942C? The 942C has better specs, 
> considering
> ESR, dV/dT and max. current.
> 
> The manufacturer's voltage ratings are very conservative and 
> you're using
> DC, won't be much of a problem then.
> 
> Regards,
> Mark
> 
> 
> 
> 
> 
> 2013/10/19 <lightningfor@xxxxxxxxxxxxxxxxxxxxxx>
> 
> > Hi,
> > I am building a large OLTC with about a 20uF capacitor.
> > I want to run about 1200vDC so I can make use of the 3ph 
> power I have
> > available.
> >
> > I will be using the familiar 940C style of cornel Dublier 
> capacitors all
> > paralleled up to give me the 20uF, but I remember Steve HV 
> recently saying
> > that caps do breakdown after some hours of use if run beyond the AC
> > rating...
> >
> > The problem is that when we serries them up to increae the 
> voltage rating,
> > it means we need LOTS of caps so more $$$$...
> >
> > The common cap is 940C20P47K-F, 0.47uF 2000v DC, 550vAC 
> rated... (so I
> > need about 170 caps in serries/parrallel)
> > But there is also a 940C30P15K-F, 0.15uF 3000v DC, but the 
> AC rating is
> > still 550vAC...? (so I need about 130 in parallel.)
> >
> > Do you think I can RELIABLY run 1200v DC into the 3000v DC 
> caps, or should
> > I just bite the bullet and pay the dollars to 
> serries/parrallel the larger
> > 2000v DC caps?
> >
> > Thanks,
> >
> > Carlos
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